Couchbase.Aspire.Client

Couchbase.Aspire.Client library

Registers IClusterProvider and IBucketProvider in the DI container for connecting Couchbase databases.

Getting Started

Prerequisites

• Couchbase or Capella cluster and connection string for accessing the cluster.

Install the package

dotnet add package Couchbase.Aspire.Client

Usage example

In the AppHost.cs file of your project, call the AddCouchbaseClient extension method to register IClusterProvider and IBucketProvider for use via the dependency injection container. The method takes a connection name parameter.

builder.AddCouchbaseClient("couchbase");

You can then retrieve the IClusterProvider and IBucketProvider instances using dependency injection. For example, to retrieve a connection from a Web API controller:

private readonly IBucketProvider _bucketProvider;

public ProductsController(IBucketProvider bucketProvider)
{
    _bucketProvider = bucketProvider;
}

If the connection string includes a bucket name, you can get the bucket instance via INamedBucketProvider without specifying the bucket name again:

private readonly INamedBucketProvider _bucketProvider;

public ProductsController(INamedBucketProvider bucketProvider)
{
    _bucketProvider = bucketProvider;
}

Configuration

The Aspire Couchbase component offers various options for configuring the database connection according to your project's requirements and conventions.

Use a connection string

When using a connection string from the ConnectionStrings configuration section, you can provide the name of the connection string as the parameter when calling AddCouchbaseClient:

builder.AddCouchbaseClient("myConnection");

And then the connection string will be retrieved from the ConnectionStrings configuration section:

{
  "ConnectionStrings": {
    "myConnection": "couchbases://username:password@server1:11207,server2:11207/mybucket?option1=value1&option2=value2"
  }
}

See the ConnectionString documentation for more information on how to format this connection string. Couchbase.Aspire.Client extends the standard connection string format by allowing the inclusion of the username, password, and bucket name directly in the connection string.

Use configuration providers

The Aspire Couchbase component supports Microsoft.Extensions.Configuration. It loads the CouchbaseClientSettings from configuration by using the Aspire:Couchbase:Client key. Example appsettings.json that configures some of the options:

{
  "Aspire": {
    "Couchbase": {
      "Client": {
        "ConnectionString": "couchbases://server:port",
        "Username": "username",
        "Password": "password",
        "BucketName": "mybucket", // Optional bucket name
        "DisableHealthChecks": false,
        "DisableTracing": false,
        "HealthChecks": {
          "Type": "Active",
          "MinimumHealthyNodes": {
            "KeyValue": 2,
            "Query": 2
          },
          "MaximumUnhealthyNodes": {
            "KeyValue": 0,
            "Query": 1
          }
      }
    }
  }
}

Use inline delegates

You can also pass the Action<CouchbaseClientSettings> delegate to set up some or all of the options inline:

    builder.AddCouchbaseClient("couchbase",
        settings => settings.ConnectionString = "couchbases://server:port");

Further tuning of ClusterOptions can be done by passing an additional Action<ClusterOptions> delegate:

    builder.AddCouchbaseClient("couchbase",
        settings => settings.ConnectionString = "couchbases://server:port",
        options => options.WithSerializer(SystemTextJsonSerializer.Create());

AppHost extensions

In your AppHost project, install the Couchbase.Aspire.Hosting library with NuGet:

dotnet add package Couchbase.Aspire.Hosting

Then, in the AppHost.cs file of your project, register a Couchbase cluster and consume the connection using the following methods:

var couchbase = builder.AddCouchbase("couchbase");
var bucket = couchbase.AddBucket("mybucket");

var myService = builder.AddProject<Projects.MyService>()
    .WithReference(bucket)
    .WaitFor(bucket);

// Alternatively, reference the cluster rather than a specific bucket, INamedBucketProvider will not be registered in DI
var myService2 = builder.AddProject<Projects.MyService>()
    .WithReference(couchbase)
    .WaitFor(couchbase);

The WithReference method configures a connection to a bucket in the MyService project named mybucket. In the Program.cs file of MyService, the database connection can be consumed using:

builder.AddCouchbaseClient("mybucket");

Health Checks

By default, health checks are enabled with the following configuration:

• Active, not passive
• Only check the Key/Value data service
• Require at least one healthy node, and allow no unhealthy nodes-

These defaults can be overridden using configuration providers or inline delegates as described in the Configuration section above.

Additional documentation

• https://docs.couchbase.com/dotnet-sdk/current/hello-world/start-using-sdk.html
• https://github.com/dotnet/aspire/tree/main/src/Components/README.md

Feedback & contributing

https://github.com/couchbaselabs/couchbase-aspire